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US 8,508,871 B2Granted
Lens barrel and image capturing apparatus
AssigneeNikon Corporation
InventorMotofusa Kageyama
Life of this patent
Estimating the term…
Abstract
Provided is a lens barrel comprising a lens holding member that holds a lens; a guide bar that has a magnetic pattern in which a pair of magnetic poles repeat in a longitudinal direction and that has the longitudinal direction thereof oriented in a direction of an optical axis of the lens to guide the lens holding section to move in the direction of the optical axis; a control portion that is disposed on an outer circumferential surface of the lens holding member and that includes a magnetic body generating magnetic force between itself and the magnetic pattern of the guide bar; and a drive coil that is arranged in a manner to not contact the guide bar and that generates magnetic drive force between itself and the guide bar.
Claims10
A lens barrel comprising:
- a lens holding member that holds a lens;
- a guide bar that includes a magnet in at least a portion thereof and that is oriented in a direction of an optical axis of the lens to guide the lens holding member to move in the direction of the optical axis;
- and
- a control portion that is disposed on the lens holding member, and that includes a non-magnetic contact surface that contacts a portion of an outer circumferential surface of the guide bar and a magnetic body generating magnetic force between itself and the magnet of the guide bar arranged at a position further from the guide bar than the contact surface, wherein
- a cross section of the guide bar in a direction orthogonal to the optical axis is substantially circular, and
- an N pole and an S pole of the magnet are present in the cross section of the guide bar such that, on a surface of the magnet, the one of the N pole and the S pole that is further from the magnetic body occupies a larger portion of the circumference of the cross section than the other of the N pole and the S pole.
3 more elements
A lens barrel comprising:
- a lens holding member that holds a lens;
- a guide bar arranged in a direction of an optical axis of the lens to guide the lens holding member to move in the direction of the optical axis;
- and
- a control portion that controls a position of the lens holding member relative to the guide bar, wherein
- the control portion includes a magnetic body and a pair of contact surfaces that contact the guide bar,
- the contact surfaces are two surfaces that intersect at an angle to form a shape that is substantially V-shaped,
- the guide bar includes a magnet in at least a portion thereof and a magnetic yoke that covers at least a portion of the magnet, and
- the magnetic yoke contacts a magnetic pole of the magnet that is further from the magnetic body and does not cover a portion of the magnet facing the magnetic body.
5 more elements
A method for moving a lens comprising:
- holding a lens with a lens holding member;
- guiding the lens holding member along a guide bar to move in a direction of the optical axis of the lens;
- and
- controlling a position of the lens holding member relative to the guide bar, wherein
- the guide bar includes a magnet in at least a portion thereof and is oriented in a direction of an optical axis of the lens,
- the controlling is done by a control portion, disposed on the lens holding member, that includes a non-magnetic contact surface that contacts a portion of an outer circumferential surface of the guide bar and a magnetic body generating magnetic force between itself and the magnet of the guide bar arranged at a position further from the guide bar than the contact surface,
- a cross section of the guide bar in a direction orthogonal to the optical axis is substantially circular, and
- an N pole and an S pole of the magnet are present in the cross section of the guide bar such that, on a surface of the magnet, the one of the N pole and the S pole that is further from the magnetic body occupies a larger portion of the circumference of the cross section than the other of the N pole and the S pole.
5 more elements
A method for moving a lens comprising:
- holding a lens with a lens holding member;
- guiding the lens holding member along a guide bar to move in a direction of the optical axis of the lens;
- and
- controlling a position of the lens holding member relative to the guide bar, wherein
- the controlling is done by a control portion including a magnetic body and a pair of contact surfaces that contact the guide bar,
- the contact surfaces are two surfaces that intersect at an angle to form a shape that is substantially V-shaped,
- the guide bar includes a magnet in at least a portion thereof and a magnetic yoke that covers at least a portion of the magnet, and
- the magnetic yoke contacts a magnetic pole of the magnet that is further from the magnetic body and does not cover a portion of the magnet facing the magnetic body.
5 more elements
Dependencies are inferred from the claim text.